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JXB Advance Access originally published online on December 12, 2003
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Journal of Experimental Botany, Vol. 55, No. 395, pp. 265-270, January 1, 2004
© 2004 Oxford University Press

Light Signalling and Clock

BRing it on: new insights into the mechanism of brassinosteroid action

Received 24 March 2003; Accepted 8 October 2003

Jennifer L. Nemhauser1 and Joanne Chory1,2,*

1 Plant Biology Laboratory, The Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA
2 Howard Hughes Medical Institute, The Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA

* To whom correspondence should be addressed. Fax: +1 858 558 6379. E-mail: chory{at}salk.edu

Several recent breakthroughs have filled in key details of the brassinosteroid (BR) response. Identification of BAK1, a BRI1 interacting protein, the negative regulator BIN2, as well as direct targets of BIN2, BZR1 and BES1, provide a link between BR perception at the cell surface and regulation of gene expression in the nucleus. Global expression studies further defined the downstream events in this pathway, confirming the role of several factors acting in negative feedback regulation on BR levels. New links to the plant hormone, auxin, were also uncovered.

Key words: Arabidopsis, auxin, brassinosteroids, light.


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